Directory support/hoffset-voffset

How to  calculate  \hoffset  and  \voffset to center textbody,
header and  footer on a page?  Your  must  set up some initial
parameters and, of course, the \textwidth.   This program will
compute such parameters as \hoffset, \voffset and \textheight.

Best wishes, Anatoly A. Zabelin (Russia, Chita).
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